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Guide Chemistry of Microporous Crystals

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Casapu, A. Tissler, R.

Althoff, Appl. B Environ. Vennestr0m, T. Janssens, A.

Crystal chemistry, properties and synthesis of microporous silicates containing transition elements

Kustov, M. Puig-Molina, L. Lundegaard, R. Tiruvalam, P. Concepcion, A. Corma, J. The ion exchange capability of zeolites originates from the fact that some of the framework Si atoms are replaced by aluminium atoms or other heteroatoms. Cu and Fe can also form suitable cations to counterbalance this negative charge, which is the reason that Cu and Fe exchanged zeolites can be produced by the method described above. Zeolites are porous crystalline aluminosilicates. There exist also other materials, which are not alumina silicates, with a porous crystal structure and a capability of ion exchange, e.

The ion exchange capability arises from the same. Even though the method of ion exchange for zeolite-based materials and silicoaluminophosphate materials is. Nevertheless, in a solution based ion-exchange with Cu, the Cu atoms are distributed through the entire volume of the material with SSZ, while the Cu has a tendency to be deposited in the outer surface of the crystals with SAPO [P. Vennestr0m, A. Katerinopoulou, R. Tiruvalam, A. Kustov, P. Moses, P. Corma, ACS Catal. As a consequence, the degree of Cu ion exchange in a SAPO material obtained with the solution based ion exchange procedure is generally low, and the Cu loadings in SAPO obtained by this method are generally.

It has been shown that such a heating procedure causes a redistribution of the Cu throughout the SAPO crystals, implying a higher degree of Cu ion exchange. An alternative procedure to introduce ions in crystalline microporous materials is by solid state ion exchange, which involves making a dry solid-state mix of the microporous materials and a compound of the cations to be introduced into the microporous crystals, followed by some appropriate treatment that will drive the cations into the microporous materials.

Price, in:, J. Regalbuto Ed. The metal oxide particles or metal salt particles are formed on the surface of the SAPO crystals by impregnation or precipitation. This procedure is different from a. The procedure prescribes a high temperature and long heating times.

Introduction

The procedure can be executed in dry or wet air. A variation of this method is described in D. Wang, L. Zhang, J. Li, K.


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Kamasamudram, W. Epling, Catal. Today , DOI Zamadics, X. Chen, L. Kevan, J. The use of mixtures of copper oxide and zeolite mixtures to remove nitrogen containing compounds in the. During heating, the mixture is preferably exposed to an ammonia or amine-containing atmosphere, with a heating rate higher than 10 K per minute.

Patent Application US discloses a method for the introduction of Fe in zeolites by exposure of the zeolites to iron-pentacarbonyl , which enables to produce zeolites with a greater number of iron sites than. Patent applications US and WO disclose a method for the production of ion exchanged metal- doped zeolites by mixing a zeolite and a compound of the active metal and grinding the mixture.

The mixture is then heated to a predefined temperature and kept at that temperature for a certain time.

Unit Cell Chemistry, Atomic Radius, Density & Edge Length Calculations, Close Packed Structures

During heating, the pressure in the reactor is reduced to mbar. This is quite surprising in view of the fact that NO alone does not enhance the ion exchange process. One advantage of the present invention is that the metal- exchanged microporous material can be produced at. This provides a preparation route for SCR active microporous materials at. Further details of the invention can be found in the following description of the invention and the dependent claims.

The crystalline microporous materials that can be used in the method according to the invention can be any. Preferably the crystalline microporous materials having an ion exchange capacity are zeolites, which are. A preferred embodiment is the exposure of the said mixture to an atmosphere containing ammonia and and one or more oxides of nitrogen, where the crystalline. Another embodiment is the exposure of the said mixture to an atmosphere containing ammonia and one or more oxides of nitrogen, where the cryrstalline microporous materials contain an organic structure directing agent.

Another embodiment is the exposure of the said mixture to an atmosphere containing ammonia and one or more oxides of nitrogen, wherein the metal compounds are metal oxides, metal nitrates, metal phosphates, metal sulfates, metal oxalates, metal acetates, or a combination thereof.

Book Chemistry Of Microporous Crystals

Another embodiment is the exposure of the said mixture to an atmosphere containing ammonia and one or more oxides of nitrogen, wherein the metals in the metal compounds are selected from the group Fe, Cu, and Co, or. Another embodiment is the exposure of the said mixture to an atmosphere containing ammonia and one or more oxides of nitrogen, wherein the metal compounds comprise one or more oxides of Cu. Another embodiment is the exposure of the said mixture to an atmosphere containing ammonia and one or more oxides of nitrogen, where the oxides of nitrogen are nitrogen monoxide, nitrogen dioxide, or a mixture thereof.

Another embodiment is the exposure of the said mixture to an atmosphere containing ammonia and one or more oxides of nitrogen, wherein the content of ammonia in the atmosphere is between 1 and vol. Another embodiment is the exposure of the said mixture to an atmosphere containing ammonia and one or more oxides of nitrogen, wherein the content of the one or more nitrogen oxides in the atmosphere is between 1 and vol.

Publication details

Another embodiment is the exposure of the said mixture to an atmosphere containing ammonia and one or more oxides of nitrogen, wherein the molar ratio of ammonia and nitrogen oxides is larger than 0. A further aspect of the invention is a metal exchanged crystalline microporous material or mixtures of metal exchanged crystalline microporous materials obtained by a method according to anyone of the previous described aspects and embodiments of the invention. Still an aspect of the invention is a method for the removal of nitrogen oxides from exhaust gas by selective catalytic reduction with a reductant, comprising.

In an embodiment of the method for the removal of nitrogen oxides according to the invention, the reductant is ammonia or a precursor thereof. In an embodiment of the method for the removal of nitrogen oxides according to the invention, the reductant is hydrocarbons. Example 1. Table 1 provides an overview of the treatment gas mixtures used in the 10 h preparation step of the catalyst, together with the SCR activity of thus prepared catalyst measured as NO conversion.

Show menu Hide menu. Content alerts Stay up to date with free content alerts via e-mail. Subscribe now. Customer account Login Register account. The reaction mixture was refluxed for 24 h. After the reaction, the mixture was cooled down, poured into EtOAc 20 mL , and filtered to remove the generated white solid. The combined EtOAc filtrates were concentrated in vacuo to give an oily solid, then adding a little methanol, white solid was generated, filtered, air dried and recrystallized in MeOH to give white solid 4.

POCl 3 2.

Book Chemistry Of Microporous Crystals

A mixture of 1,2-phenylenediamine 0. After completion of the reaction, the reaction mixture was dissolved in EtOH 10 mL and then poured into ice-water 30 mL. Single crystals of 6 for X-ray diffraction experiments were obtained from ethyl acetate-dichloromethane mixture A colorless crystal with a size of 0. And powder X-ray diffraction at room temperature was carried out to testify the phase purity of assynthesized samples, the diffraction peaks of both simulated 25,26 and experimental patterns match in the key positions, indicating the pure phase of 6.

PXRD pattern of 6 at room temperature can be found in Figure 2. The molecular structure and atom numbering of 6 are shown in Figure 3 , and the crystal packing of 6 along the c axis is presented in Figure 4. Due to the intramolecular hydrogen bonds from carboxylic oxygen atoms O4, O7, O9 and ether oxygen atoms O1, O2, microporous skeleton along the c axis is formed.


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And the intermolecular hydrogen bonds between carbonyl oxygen atoms O4 and O9 from a neighboring molecule are observed to extend supramolecular organic frameworks. Table 3 lists some selected bond lengths and torsion angles for 6 to demonstrate the whole molecular skeleton. It can be found that the carbon-carbon bond lengths are basically intermediate between typical C-C single 1.

Synthesis and Characterization of Electronically and Ionically Conductive MOFs and COFs

The coplanarity adopted for benzene and imidazole enables delocalized electrons transfer and enhances the fluorescence. The tertiary amino group is distorted from planarity of phenyl ring, and the four straight chains of acetic acid methyl ester, which are connected to nitrogen atoms in benzene rings, keep certain angles and make the intramolecular hydrogen bonds possible, thus micropores are formed, as indicated clearly by the intramolecular hydrogen bonds from carboxylic oxygen atoms O4, O7, O9 and ether oxygen atoms O1, O2.

And the intermolecular hydrogen bonds between carbonyl oxygen atoms O4 and O9 from a neighboring molecule are observed to extend supramolecular organic architecture. Fluorescent spectrum and luminescent lifetime.


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The solid state fluorescent spectrum of 6 at room temperature is given in Figure 5. The emission peak at The investigated molecule 6 is fluorescent and has two luminescent lifetimes. Furthermore, single crystal X-ray diffraction study indicates that the electrons are delocalized and inter-, intramolecular hydrogen bonds are displayed in the molecular system. The planarity of molecular skeleton and luminescence make delocalized electrons transfer and migration possible.